Pressure-regulating valve



0. M. JON-ES.

PRESSURE REGULATING VALVE. APPLIQATION FILED SEPT. 9, 1918. v

1,364,061. Patented Dec. 28, 1920.

. 2 SHEETS$HEEI I.

IN l/EIVTOI? 0. M. JONES.

PRESSURE REGULATING VALVE. APPLICATION FILED SEPT. 9 191a.

Patented Dec. 28, 1920.

2 SHEETSSHEET 2.

IN l/E N 70/? T 0 all whom' it mayconcem:

' cam-1o. STATES PATENT H OFFICE.

ownn MARSHALL JONES, or NEW YORK, N. Y.

PBESSURE-REGULATING VALVE.

- Be it known that I, OWEN J ONES, a citizen of the United States, and aresident of the borough of Manhattan, city, county, and State or NewYork, (whose postoflice address is 601 West 149th street, New York city,New York,) have 1nvented Improvements in Pressures Regulating Valves, ofwhich" the following is a specification.

This invention relates to improvements in' valves of the type known aspressure regulating valves, which are used to regulate the pressure offluids in containers into which fluid under pressure is deliveredthrough the valve. This particularly applies where the pressure to bemaintained in the containers is less than the fluid pressure in themeans from which the container is supplied through the fluid pressureregulating valve. This type of valve is employed to automatically closeand shut off the supply of fluid to the container when the pressure-inthe container has reached the predetermined de- This invention is animinvention coveredv by Patgranted me November 21,

sired pressure.

provement on m cnt No. 1,205,89 1916. vention additional mechanism anddevices and have eliminated some of the parts embodied in the inventionreferred to and have designed the piston H of a diameter greater thanthe diameter of the piston G so that the valve can be used for and willperform the functions above stated. This invention may be used in anyconnection in which it is found applicable. 1

In commonly speaking of this class of valve the chamber in the valvebody located between the inlet and the valve seat is referred to as thehigh pressure side of the valve. and the chamber located between thevalve seat and the outlet from the valve body is referred to as the lowpressure side of the valve. Therefore I will use these terms in statingthe objects of this invention. in the description of the accompanyingdrawings. and in stating the operationof the valve.

The objects of the invention are to improve upon and simplify theconstruction of such valves and to increase their ability and efficiencyto automatically shut off the flow of fiuids'through them.

Other objects of the invention are to elimi- Specification LettersPatent.

MARSHALL I have embodied in this present in- Patented Dec. 28, 1920.

Application sled se tember'e, 1918. Serial No. 253,264.

nate chattering of the valve and shock of the valve when seating.

Further objects are to produce such valves which will be sensitive andwill operate promptly when the desired fluid pressure to be maintainedis reached.

Further objects are to produce a valve of this class in which mechanicalfriction is eliminated as far as possible.

Further objects are to producea valve of th1s class which may not beadjustable and will be closed only by the specific operating pressurefor which it is designed.

Further objects are to produce a valve of th1s class with means foradjusting it so that it will operate by any one of the range ofpressures for which it is desi ned.

Further ob ects are to pro uce a valve of this class which will closeand remain closed when one or both of the pressure actuated means whichautomatically open or close the valve become inefficient due to beingruptured, leaky or any other cause.

Further objects are to produce a valve of this class in which both theautomatic opening and closing of the valve is performed by meanscontrolled bythe pressure in the low pressure side of the valve. v

Further objects will be apparent from the following description.

An illustrative embodiment of the invention has been selected herein forthe purpose of description, same being shown in the accompanyingdrawings, wherein Figure 1 1s a longitudinal section of a form of thistype of valve which is without means of adjustment,

Fig. 2 is a modification of Fig. 1 and has means of adjustment tooperate under variable pressures,

Fig. 3 is another modification of Figs. 1 and 2 Fig: 4; is anillustration of the valve partly in longitudinal section and is amodification of Figs. 1 and 2, and

a positive pressure regulating valve is re qulred, in other words wherethe valve is to be produced for maintaining a specific pressure in thelow pressure side of the valve. A is a valve body or casing which may beof any suitable metal. I am not to be understood as limiting myself tothis particular form of body as other forms may be valve seat extendinginto the valve cham used in accordance with my invention. B is theinlet. C is the valve chamber in whlch the valve Itravels-longitudinally. s is a signed, andeach isof a diameter greaterthan the diameter of the .valve, andthe piston H'is of a' diametergreater than the diameter of the piston G. L is a hollow top cover andalso forms part of the piston chamber F. N is a by-pass connecting thetwo end chambers of the casing. K is a spindle or rod on which the twopistonsand the valve are rigidly mounted in their respective positionsone common axis, therefore the pistons and valve travel simultaneouslyin like directions. 0 is a port for admitting and exhausting air betweenthe two pistons, the air forming a cushion so that the pistons will moveslowly u wardly or downwardly to prevent the shoe on the valve or on thepistons at the end of their travel.

' The operation of the valve isas followsr The fluid underpressureenters the valve chamber C through the inlet B and passes through theby-pass N into piston cham-- 'ber F and forces the piston .G downwardliyI closed by the pressure thusexerted against which opens and holds uponthe valve The fluid then flows around the valve and through the openingin-the seat and enters the discharge .chamber and passes out through theoutlet 1 to the vessel in which is to be-maintained'a pressure less thanthe ressure of the fluid entering the valve body. QVhen the pressure onthe low pressure side of the valve rises'to the desired predeten.

mined pressure, the piston H is forced-upwardly and the valve is closedand held the piston H. The valve thus remains closed. until the pressureagainst the piston H decreases, then the valve is again opened bv thepressure exerted against the piston (1. In Fig. 2 I have shown amodification of vthe valve show-n in Fig. 1 in .so far that I havemodified the shape of the body, have the stulilng box 3 and the cembodied a stufling box on top ofthe bonnet, a ring on the inside of thebonnet which is an integral part of it, pressure resisting means forexerting pressure against the spindle K and a yoke-on top of the bonnet.In all other respects and in operation, this form of valve is similar tothe valve shown in Fig. 1. The pressure resisting means therein shown isfor adjustment so that the piston H can be made responsive to varyingpressure in the low pressure side of the valve. In other Words thepressure resisting means can be adjusted so the valve will be closed atone of many predetermined pressures in the lowpressure side within therange of pressures for which the valve is designed, the pressureresisting means exerting pressure against the upper end of the spindleK. I have preferably shown the pressure resisting means in the form of aspring in combination with several other.

parts. Referring to the pressure resisting means 4 is a spring. 5 and 6are plates between which the spring is engaged. 2 is a rod attached toplate 5 and asses through iiamber F and engages the upper end of thespindle K. 7- is an adjusting screw for increasing or decreasing thecompression of the spring 41 1 is a yoke for -carrying the adjustingscrew and is suitably attached to or may be an integral part of thebonnet.

The operation of the pressure resisting means is as follows: The springis set so that it will yield to an average pressure exerted against thebottom of the piston H. Ifthe pressure on the low pressure side of thevalve is lower than the average for which the spring .is set, then thecompression of the .spring is accordingly decreased. 10! If thepressurein the low ressure side of j the valve is higher than hepressure for which the spring was originally set, then the compressionof the spring is increased. In this way the valve can be settoautomatirally close at different desired predetermined pressures inthe low pressure side.

In Fig. 3 I have showna modification of Fig. 2 in so'far as the designof the body,

the bonnet, the spindle and the pressure re- 116 sisting means areconcerned and that I have eliminated the stufllngbox and havesubstituted the flexible diaphragms G and II for pistons G andH-respectively and have embodied a connecting shell [2 between the 120lower section of the valve body and the uppermost piston chamber andplaced abonnet or cover-at the upper-end of the shell so as to (providea chamber in which diaphragm 1' can travel.

The operation of the diaphragm, the valve, and the, pressure resistingmeans are respectively similar to the corresponding parts in .Fig. 2-.-Referring to ..the pressure resisting means 4' is a spring engagedbethe diaphragm H.

' able downward 100 protruding t tween the plates 100 and 5' and isadjustable to yield to varying pressure exerted against the bottom ofand under variable compression exerts varipressure against the dlaphragmH- thus resisting pressure under The spring is placed under compressionby screwin downwardly the nuts P and P on the olts 102 and 102 which enage the endsof the plate iron h the o enings 103 and 103 in the wall 0the shel p and the compression nuts upwardly. The operation of theresistin means is the same as the reslstmg means in ig. 2, in that it isoriginally set to yield to an average pressure under the diaphra H. Ifthe valve is to be closed when t e pressure in the low pressure sideexerted against the bottom of the d aphragm H is less than the averagepressure for vwhlch the spring has been set, then the compression of thespring is accordingly decreased. If the r so valve is to be closed whenthe pressure 1n the low pressure side exerted against the bottom of thediaphragm H is more than the average pressure for which the spring hasbeen set, then the compression of the sprin is accordingly increased.

In ig. 4 I have shown a modification of Fig. 2 in so far as the designof the body, the

bonnet and the pressure resisting means are.

' concerned and that I have eliminated the stufling box and yoke shownon top of the bonnet in Fig. 2. The pressure resisting 3. In this valveIhave embodied a shell for connecting'the lower section of the valve bodyand the uppermost piston chamber, the byassN' with a pilot valve locatedtherein, t e pilot valve being shown in side elevation in this figurewith a portion of the body broken away and in detail in the longitudinalcross-section view in Fig 5, a by-pass connecting the high pressure sidewith the low pressure side of the valve, and a by-pass connecting the.low pressure side of the valve with the piston chamber in the top ofthe pilot valve body. In addition to performing the functions which areperformed by the valves shown in Figs. 1 and 2, this valve will closeand remain closed when one or both of the pressure actuated means whichautomatically open or close the valve become inefiicient due to beingruptured, leaky or any other cause, and the means for automaticallyopening and closing the valve are controlled alone by the pressure inthe low pressure side of the valve, as will be apparent from thefollowing description in which I refer jointly to Fig. 5 in stating thedetails of the'features, parts, performance, of the pilot valve. casingwhich may A is a valve body or be of any suitable metal.

the. diaphragm H,

is decreased by screwing the,

in like directions. ing the valve chamber C with the inlet end functionsand operation.

- I am not to be understood as limiting myself to this particular formof body as other forms may be used in accordance with my invention. B.is the inlet. C is the valve chamber in which the valve I travelslongitudinally. s is a valve seat extending into the valve chamber. 'Dis the discharge chamber with'the outlet 9. E is the piston chamber inwhich piston H travels longitu dinally, and the piston is for closingthe valve when sufficient pressure is applied against the bottom of it,chamber in which piston G travels longitudinally and this plston is foropening the valve 7 when suificient pressure is applied against the topof it. The two pistons are of the proper d'ameters to. perform thefunctions for which they are designed and each is of a diameter greaterthan the diameter of the valve and the piston H is of a diam- F is apiston eter greater than the diameter of the piston G. piston chamberdle or rod on which the two pistons and the valve are rigidly mounted intheirrespective positions on a common axis, therefore the pistons andthe valve travel simultaneously N is a by-pass connect-- L is a hollowtop cover in which the of the pilot valve 110, 4'

v is a pressure resistlng means preferably shown herein in I the form ofa spring engaged. between the plate 100 and the top of the pistonH, the,spring is adjustable to yield to var ing p pressure exerted against thebottom ot the means embodied in. thls valve is similar to 1 ,that shownin Fig;

piston H and under variable compression exerts variable downwardpressure against the piston H, thus resisting pressure under the pistonH. The spring is placed under compression screwing downwardly the nuts Pon thebolts 102'which engage the ends of the plate 100 protrudingthrough the openings 103 ,in the wall of the connecting shell p, and thecompression is decreased by screwing the nuts upwardly. 110 is'a pilotvalve connected to the piston chamber comprising a valve body or casinghavingan inlet 111 and an outlet 111', a valve chamber 113'. a valve 113in the valve chamber opening toward the inlet 111, a valve seat 112extending into the valve chamber 113'. a diaphragm 119 operating in thediaphragm chamber 118 for actuating the valve 113. a spindle ll-i havinga hollow enlargement at its upper end with the chamber 124 therein and aport l29'axially located in the spindle connecting the opening F islocated. K is-a spindownwardly the pin 120 and the screw sleeve 121 foropening the valve 113 at will, an exhaust valve 122 with a dpinextending upwardly from its beveled en the chamber 127 for stopping theflow of fluid through the port 129 in the spindle, a sprin 117 locatedbetween the bottom of the chamber 127 and the underside of the valve 122for holding the valve up, and a valve seat 124 in the end of the chamber127 in the enlarged end of the spindle 114 with a beveled seat 126 inits under side and a beveled seat 125 in its upper side with a portforming an opening between and connecting the two seats. 200 is aby-pass with the sto valve 201 located therein connecting the highpressure with the low ressure si the valve. By eliminating rom thisvalve .the by-pass 200, the by-pass 130, the pilot valve 110 andconnecting the upper end of the by-pass N to the upper piston chamber,and the pressure resisting means, then the valve would operate similarto the valve shown in Fig. 1. By eliminating all of the above mentionedparts with the exception of the pressure resisting means the valve wouldthen'operate similar to the valve shown in l i 2. x The operation ofthis valve complete with.

all the parts herein shown and described is as follows: To start thisvalve operating it is necessary to set the spring 4' so it will yield tothe predetermined pressure desired to be maintained in the low pressureside of the valve, then open the stop valve 201 to permit fluid from thehigh pressure side of the valve. to flow through, the by-pass 200, or byemploying a by-pass around thevalve which in general practice isinstalled where a pressure regulating valve is used, thereby pressure issupplied to the low pressure side of the valve and passes through the by-pass 130 to the diaphragn'i chamber 118' in the pilot valve and forcesthe diaphragm downwardly, then the stop valve 201 is closed, thediaphragm when forced downwardly moves the valve 113 from its seat andholds .it away from its seat as the diaphrag'in is designed of asufficient area so that a very low pressure from the low pressure sideof the valve will overcome the pressure from the high pressure side ofthe valve exerted against the under side of the valve '113 through theby-pass N. The fluid passes operatable in crate by moving downwardlyeofthrough the by-pass N and through the opening in the seat 112 throughthe disthe valve seat 8 until the predetermined pres sure desired in thelow pressure side of the valve is reached. If that pressure is exceededthe piston H is moved upwardly and closes the valve I and holds itclosed until the pressure in the low pressure side of the valve drops tothe normal pressure desiredto be maintained, then the valve is againopened; It is obvious that the means by which the valve is automaticallo ened and closed are controlled by the i i pressure supplied from thelow pressure) side of the valve when the valve operates entirely automatically. The valve can'be started to op-' the pin 120 against the endof the by forcin it downwar ly by pulling the (pilot valve spindle lever123 ownwardlythereby bringing the conical end of the pin into engagementwith the seat 125 thus closing the outlet throu h the seat, and bycontinuing to move it e pin downwardly until the valve 113' is movedaway from its seat and by holding it awa- 'from its seat will allowpressure from t e high pressure side of the valve to be exerted inst thepiston G. The pilot valve will kept open until sufiicient pressureenters the low pressure side "of the valve and through the by-pass 130against the dia hragm 119 to hold the ilot valve open. he in whenemploye as above together wit valve 113 and the piston G forms means bywhich the valve can be opened at will as desired, and would also permitof the valve being started in operation without the neoessity of openingthe by-passes connecting the hi h and w en it is not desired to have themeans the spindle 114, theand low pressure sides of the valve,

by which the automatic opening and closing of the valve is performedcontrolled alone by the fluid pressure supplied from the low pressureside of the valve. ton H break, be ruptured or become leaky ordamagedfrom any cause or should there be a leak beyondtlre low pressure side'of the valve thus killing the pressure on top Should the pisof thediaphragm 119 orshould the dia I phragm 119 become'ruptured or leaky sothat pressure could not be maintained on it, then the pressure exertedagainst the under side of the valve 113 would close that valve Y andshut ofi the pressure against the top of the piston G and the pressureagainst the bottom of the valve I would push the valve I upwardly andclose the valve as thefluid remaining in the piston chamber F wouldconstruction shown and described, nor

be exhausted through the opening 128 and port 129 in the spindle 114 andpass out around the valve 122 and through the valve seat 126 toatmosphere, the valve 122 having been opened when the valve 113 movedupwardly as the pin on the valve 122 is enaged b the end of the pin 120which has orced tiie valve 122 from its seat. the piston G break, beruptured or become leaky or damaged from any cause to such an extentthat the pressure for forcing it down to keep the vvalve open cannot bemaintained on the top of the piston then the pressure against the bottomof the valve I will push the valve I upwardly and close the valve andhold it closed.- It is obvious that the valve 1 together with thepressure exertedagainst the bottom of it-forin means for automaticallyclosing the valve when the means for automatically opening and closingthe valve fail to perform the functions for which they are intended.

It is to be understood where I have shown a piston or pistons and wherethe words piston or pistons are used that I do not limit myself to apiston or pistons as it may be desirable -to use a flexible diaphragm orother structure performing functions similar to the functions performedby a piston, as in accordance with common understanding a"; flexiblediaphra m. is' the equivalent of a piston. Nor am to be understood aslimlting myself to the use of a flexible diaphragm where shown andmentioned as it may be desirable to substitute one of its equivalentsfor it.

Obviously, some features and parts of this invention'may be used withoutothers, and my invention may be embodied in widely varying forms. I amnot to be understood as limiting myself to the construction andarrangement and combination of parts as shown and described, as othercombinations and equivalents of the parts may be used to variouslymodify my present invention within the scope of the subjoined claims.

Therefore, without limiting'myself to the enumerating equivalents, Iclaim as my invention-- 1. In a pressure regulating valve comprising acasing or body having an inlet and an outlet, a valve chamber, a valvein the valve chamber opening toward the inlet, a valve seat extendinginto the valve chamber with the surface of the face of the valve seatlocated transversely to the common axis of the casing, a dischargechamber on the opposite side of the valve seat from the valve chamber,two piston chambers located above and in direct line with the dischargechamher, two pistons each of a diameter greater than the diameter of thevalve operatable within their respective chambers, one of Should thesaid pistons actuates the valve to 0 en it,

and the other piston actuates the va ve to close it, the said chambersand the said tions, and a by-pass connecting the said valve chamber andthe u permost piston chamber for supplying flui pressure on top of thepiston operating in the uppermost piston chamber, as and. for thepurpose set forth. 7

2. In a pressure regulating valve comprising a casing or body having aninlet and an outlet,.a valve chamber, a valve in the valve chamberopening toward the inlet, a valve seat extending into the valve chamberwith the surface of the face of the valve seat located transversely tothe common axis of the casing, a discharge cham ber on the opposite sideof the valve seat from the valve chamber, two piston chambers locatedabove and in direct line with bers and the said valve and the said valveseat are located in the order mentionedand in a direct line on a commonaxis, a spindle on which the said valve and the said two pistons arerigidly attached in their respective positions and travel simultaneouslywith it in like directions, and a by-pass with a pilot valve locatedtherein connecting the said valve-chamber and the uppermost pistonchamber for supplying fluid pressure on top of the piston operating inthe uppermost piston chamber, as and for the purpose set forth.

1 3. In a pressure regulating valve comprising a casing or body havingan inlet and an outlet, a valve chamber, a valve in the valvechamber'opening toward the inlet, a valve seat extending into the valvechamber with the surface of the face of the valve seat. locatedtransversely to the common axis of the casing, a discharge chamber onthe chamber, two pistons each of a diameter greater than the diameter ofthe valve operatable within their respective chambers, one of the saidpistons actuates the valve to open it and the other piston actuates thevalve to close it, the said chambers and the said valve and the saidvalve seat are located in the order mentioned and in a direct line on aof the casing, a dischar v opposite side of the va ve seat from thechamber,

common axis, a spindle on which the said valveand the said twopistonsare rigidly attached in their respective positions and travelsimultaneously with it in like directions, a by-pass with a pilot valvelocated therein connecting the said valve chamber and the uppermostpiston chamber for sup-.

plying fluid pressure on top of the piston operating in the uppermostpiston chamber, and pressure resisting means adjustableto exert varyingpressure against one of the said pistons located nearest to the-saiddischarge 'ch'amber,as and for the purpose set forth.

4. In a pressure regulating valve com-- chambers and the said ,valve andthe said valve seat are located in the order men-' tioned and in adirect line on a common axis, a spindle on which thesaid valve and thesaid two pistons are rigidly attached in their, respective positions, aby-pass with a pilot valve-located therein connecting the said valvechamber and the uppermost piston chamber, and a by-pass connecting thediaphragm chamber shown in the said pilot valve withthe low pressureside of the first said valve, as and for the purpose'set forth; 5. In apressure regulating valve com-, prising a casing or .bodyhaving an inletand an outlet, .a valve chamber, a valve in the valve chamber openingtoward the inlet, a

valve seat extending into the valve chamber with the surface of the faceof the valve seat located transversely to the common axis chamber on thevalve chamber, two piston chambers located above and in direct line withthe discharge two pistons each of a diameter I greater thanthe diameterof the valve-operatable within their respective chambers, the saidchambers and the said valve and the said valve seat are located in theorder mentioned and in a direct line on a common axis, a spindle onwhich the said valve and the I said two pistons are rigidly attached. in60 their respective positions, a by-pass with a pilot valve locatedtherein connecting the said valve chamber and the up ton chamber, abyphragm chamber s valve with the low pressure'side of the first rmostpisass connecting the diaown in the said pilotsaid valve, and meansadjustable to ield to varying pressure under the one o the said pistonchambers located nearest to the said discharge chamber, as and for thepurpose set forth.

. .6. In a pressure regulating valve comprising a casing or bodyhaving-an inlet and an outlet, a valve chamber, a valve in the valvechamber opening toward the inlet, a valve seat extending into the valvecham b'er'with the surface of the face of the valve seat locatedtransversely to thecommon axis of the casing, a discharge chamber on theopposite side of the valve seat from the valve chamber, two pistonchambers located above and in direct line with the discharge chamber,two pistons each of a diameter greater than the diameter of the valveoperatable within'their respective chambers,.the said chambers and thesaid valve and the said valve seat are located in the order mentionedand in a direct line on a common axis, a spindle on which the sald valveand the 1 said two pistons are rigidly attached in their respectivepositions, a by-pass with a pilot valve located therein connecting thesaid valvechamber and the uppermost piston chamber, phragm chamber shownin the said pilot valve with the low pressure side of the first saidvalve, and a by-pass with a stop valve located therein connecting thehigh pressure, low pressure side of the valve, as and for the purposeset" side of the valve and the forth. v

7. In a pressure regulating valve comprising a valve body or caslnghaving a valve chamber, a valve seat and a valve in the said valvechamber, means for automatically opening and closing the valve,

means for automatically closing the valve when the said means forautomatically opening and closing the valve fail to perform thesefunctions, means by which the automatic opening and closing of the valvea by-p'ass connecting the diaarecontrolled by the fluid pressuresupplied from the low pressure side of the valve, and means b whichthe'valve can be opened at will as esired.

8. In a pressure regulating valve the combination of a valve body orcasing-having an inlet and an outlet, a valve chamber, a valve seat anda valvein the said valve chamber, and apilot valve comprisin a valvebody or casing having an inlet an an outlet, an inlet valve chamber,an-inletvalve seat with its face on the side next to the said inletvalve chamber, an inlet valve traveling in the saidinlet valve chamber,a discharge chamber on the opposite side ofthe said inlet valve seatfrom the said inlet valve chamber, a diaphragm chamber, a diaphragmchamber, a spindle on which the said inlet valve and the saiddiaphragmaT'erigidIy operatable in the said diaphragm chamber therein andlargement, a disk located in the top of the chamber in the saidenlargement at the top of the said spindle having a beveled seat on bothits top and bottom sides and a port throughits center connecting the twoseats, an outletyalve operatable in the chamber in the said enlargementat the top of the said spindle, a pin slidably movable through the topof the said yoke and engagin a slidably movable internally threaded seeve, a

in, and a spring enlever engaging the said the flanged head of gagingthe under side 0 the said pin, as and for the purpose set forth.

9, In a pressure regulating valve comprising a casing or body having aninlet and an outlet, a valve chamber, a valve in the valve chamberopening toward the inlet, a

valveseat extending into the valve chamber with the surface of the faceof the valve valve chamber,

seat located transversely to the common axis of the casing, adischar'ge'chamber on the opposite side of the valve seat from the twopiston chambers located above and in direct line with the dischargechamber, two pistons each of a diameter e'ater than the diameter of thevalve operatablewithin their respective chambers, the

said chambers and the said valve and the.

' said valve seat are located in the order mentioned and in a directline on a common c axis, a spindle on which the said valve and v thesaid two pi tons are rigidly attached in their respective positions, aby-pass with a pilot valve located therein connecting the said valvechamber and the uppermost piston chamber, a by-. ass connecting thediaphragmchamber s own inthe said pilot a valve with the low pressureside of the first saidvalve, a by-pass with a stop valve 10-cated'therein connecting the high pressure side of the valve and the lowpressure side of the. valve, and means adjustable to yield to varyingpressure under the one of the said pistons located nearest to the saiddischarge chamber', as and for the purpose set forth.

10.- Ina pressure regulating valve comprising a casing or body having aninlet and an outlet, a valve chamber, a valve in the valve chamberopening toward the inlet,

her with the surface of the face of the valve seat located transverselyto the -common axis of the casing, a discharge chamber on the oppositesideof the valve seat from the valve chamber, two piston chamberslocated above 55. a valve seat extending into the valve'chamand indirect line with the discharge chamher, two pistons each of adiametergreater than the diameter of the valve operatable within theirrespective chambers, one of the said pistons actuates the valve to openit and the other piston actuates-the valve to close it, the saidchambers" and the said valve and the said valve seat are located in theorder mentioned and im a direct line on a common axis, a spindle onwhich the said valve and the said two-pistons are-rigidly attached intheir respective positions and travel simultaneously with it in likedirections, a bya'ss connecting the said valve chamber an the uppermostpiston chamber for supplying fluid ptessure on top of the pistonoperating in he uppermost piston chamber,- and pressure resisting meansadjustable to exert varying pressure against the one of the saidpistonslocated nearest to the said'discharge chamber, as and for the purposeset forth. e

In testimony whereof, I have signedmy .name to this specification this7th day of September, 1918.

v I OWEN MARSHALL J ONES.

